Hi,
On 12/08/2010 03:14 PM, Mauro Carvalho Chehab wrote:
Grey format is like YUV, with U/V channels with 0. Add the corresponding
bits to libv4l, for it to handle this format.
Signed-off-by: Mauro Carvalho Chehab<[email protected]>
diff --git a/lib/libv4lconvert/libv4lconvert-priv.h
b/lib/libv4lconvert/libv4lconvert-priv.h
index 61a8c39..2680ed7 100644
--- a/lib/libv4lconvert/libv4lconvert-priv.h
+++ b/lib/libv4lconvert/libv4lconvert-priv.h
@@ -127,6 +127,15 @@ void v4lconvert_swap_rgb(const unsigned char *src,
unsigned char *dst,
void v4lconvert_swap_uv(const unsigned char *src, unsigned char *dst,
const struct v4l2_format *src_fmt);
+void v4lconvert_grey_to_rgb24(const unsigned char *src, unsigned char *dest,
+ int width, int height);
+
+void v4lconvert_grey_to_yuv420(const unsigned char *src, unsigned char *dest,
+ const struct v4l2_format *src_fmt);
+
+void v4lconvert_grey_to_rgb24(const unsigned char *src, unsigned char *dest,
+ int width, int height);
+
void v4lconvert_rgb565_to_rgb24(const unsigned char *src, unsigned char *dest,
int width, int height);
diff --git a/lib/libv4lconvert/libv4lconvert.c
b/lib/libv4lconvert/libv4lconvert.c
index f08996a..26a0978 100644
--- a/lib/libv4lconvert/libv4lconvert.c
+++ b/lib/libv4lconvert/libv4lconvert.c
@@ -43,6 +43,7 @@ static void v4lconvert_get_framesizes(struct v4lconvert_data
*data,
v4lconvert_try_format for low resolutions */
static const struct v4lconvert_pixfmt supported_src_pixfmts[] = {
SUPPORTED_DST_PIXFMTS,
+ { V4L2_PIX_FMT_GREY, 0 },
{ V4L2_PIX_FMT_YUYV, 0 },
{ V4L2_PIX_FMT_YVYU, 0 },
{ V4L2_PIX_FMT_UYVY, 0 },
@@ -839,6 +840,23 @@ static int v4lconvert_convert_pixfmt(struct
v4lconvert_data *data,
}
break;
+ case V4L2_PIX_FMT_GREY:
+ switch (dest_pix_fmt) {
+ case V4L2_PIX_FMT_RGB24:
+ case V4L2_PIX_FMT_BGR24:
+ v4lconvert_grey_to_rgb24(src, dest, width, height);
+ break;
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_YVU420:
+ v4lconvert_grey_to_yuv420(src, dest, fmt);
+ break;
+ }
+ if (src_size< (width * height)) {
+ V4LCONVERT_ERR("short grey data frame\n");
+ errno = EPIPE;
+ result = -1;
+ }
+ break;
case V4L2_PIX_FMT_RGB565:
switch (dest_pix_fmt) {
case V4L2_PIX_FMT_RGB24:
diff --git a/lib/libv4lconvert/rgbyuv.c b/lib/libv4lconvert/rgbyuv.c
index f205b39..c3b6235 100644
--- a/lib/libv4lconvert/rgbyuv.c
+++ b/lib/libv4lconvert/rgbyuv.c
@@ -575,3 +575,31 @@ void v4lconvert_rgb565_to_yuv420(const unsigned char *src,
unsigned char *dest,
src += 2 * src_fmt->fmt.pix.bytesperline - 2 *
src_fmt->fmt.pix.width;
}
}
+
+void v4lconvert_grey_to_rgb24(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ int j;
+ while (--height>= 0) {
+ for (j = 0; j< width; j++) {
+ *dest++ = *src;
+ *dest++ = *src;
+ *dest++ = *src;
+ src++;
+ }
+ }
+}
+
+void v4lconvert_grey_to_yuv420(const unsigned char *src, unsigned char *dest,
+ const struct v4l2_format *src_fmt)
+{
+ int x, y;
+
+ /* Y */
+ for (y = 0; y< src_fmt->fmt.pix.height; y++)
+ for (x = 0; x< src_fmt->fmt.pix.width; x++)
+ *dest++ = *src++;
+
+ /* Clear U/V */
+ memset(dest, 0, src_fmt->fmt.pix.width * src_fmt->fmt.pix.height / 2);
This is wrong the "0" value for U/V is 0x80 (U and V are signed, but not two's
complement instead their range is up shifted by 0x80)
Otherwise the patch looks good.
Regards,
Hans
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